JPH036809A - Electrolytic capacitor device - Google Patents

Abstract

PURPOSE:To reduce wiring inductance of an electrolytic capacitor by aligning wide copper plates as conductors at an interval laterally, and arranging electrolytic capacitors in parallel between copper plate terminals. CONSTITUTION:Wide copper plates 5, 6, 6', 5' are used as conductors, aligned at an interval laterally, and electrolytic capacitors 4 are connected to be disposed in parallel between copper plate terminals. The plates 5, 5' are disposed at the terminal side, the part of a flange 5a is secured to a flat plate 7 by welding as an angle material, and raised or lowered perpendicularly from the left or right end of the plate 7. A flange 8 is connected to other electric component. The plates 6, 6' are bent in a U-shaped frame, and so aligned between the plates 5 and 5' that coupled parts 6a are alternate. Since the plates 5, 6, 6', 5' and the plate 7 are wide a current flowing to the capacitor 4 through the plates 5, 6, 6', 5' from the plate 7 to the capacitor 4 is dispersed due to its skin effect, and a wiring inductance is not increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrolytic capacitor unit connected to a DC intermediate circuit in a power conversion device that uses a semiconductor switching element such as a SIRIS element as a switching element.

[Conventional technology]

In the electrolytic capacitor unit of the DC intermediate circuit of the Cyrisk converter, the method shown in FIG. 2 is used as a connection method for parallel and series connections.

In the figure, reference numerals 1 to 3 indicate relatively narrow copper bars, among which a plurality of copper bars 2 protrude from the copper bars 1 and 3 in parallel so as to be perpendicular to each other. These comb-shaped copper bars are interlocked so that the copper bars 2 are arranged alternately, and the electrolytic capacitor 4 is connected between the copper bars 2.

[Problem to be solved by the invention]

Electrolytic capacitor 4 made of copper bars 1 to 3 shown in FIG.
In the connection method, since these copper bars 1 to 3 are narrow conductors, when the number of electrolytic capacitors 4 in parallel or in series is large, the wiring inductance between the PN terminals increases. As a result, due to the increase in wiring inductance, there was a risk that the protection function of the SIRISK element as a switching element would be degraded.

An object of the present invention is to provide an electrolytic capacitor unit that can eliminate the disadvantages of the conventional example, reduce the wiring inductance of the electrolytic capacitor, and improve the protection function of the thyristor element.

[Means to solve the problem]

In order to achieve the above object, the present invention uses wide copper plates as conductors, arranges the copper plates at intervals in the width direction, and arranges electrolytic capacitors in parallel between the ends of each copper plate. It is something.

[Effect]

According to the present invention, since the conductor used is a wide copper plate, the skin effect is large and the current can be dispersed.
Wiring inductance is reduced.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the electrolytic capacitor unit of the present invention, in which wide copper plates 5° 6.6°, 5
These copper plates 5.6.6"5" were arranged at intervals in the width direction, and electrolytic capacitors 4 were connected and arranged in parallel between the ends of each copper plate.

The copper plate 5.5' is on the terminal side, and is an angle member whose flange 5a is fixed to a flat plate 7 by welding or the like, and rises or falls at right angles from the left and right ends of the flat plate 7. Further, one end of the flat plate 7 was bent to the side opposite to the copper plates 5, 5° to form a flange 8, and this portion was used as a connection portion to other electrical components.

The copper plates 6.6'' are bent into a U-shaped frame and are arranged between the copper plates 5, 5'' so that the connecting portions 6a alternate.

The electrolytic capacitors 4 are connected in parallel by connecting the electrolytic capacitors 4 in parallel between the 1[5, 6, 6', and 5° angles arranged in the width direction of the cone-5. become.

The current that flows from the flat plate 7 to the electrolytic capacitor 4 via the copper plates 5, 6, 6°, 5" between the P terminal on the positive side and the N terminal on the negative side 7 is wide, it is dispersed by the skin effect, and the wiring inductance does not increase.

〔Effect of the invention〕

As described above, the electrolytic capacitor unit of the present invention can reduce wiring inductance when electrolytic capacitors are connected in parallel and in series, and in the DC intermediate circuit of a power converter, the electrolytic capacitor unit of the present invention can reduce the wiring inductance as a switching element constituting the converter. It is possible to improve the protection function of the element.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the electrolytic capacitor unit of the present invention, and FIG. 2 is an explanatory view showing a conventional example. 1.2.3 - Copper bar 4 Electrolytic capacitor 5.
5°, 6, 6°...Copper plate 5a, 8...Flange 6a...Connection part 7...Flat plate Fig. 2

Claims (1)

[Claims] An electrolytic capacitor unit characterized in that wide copper plates are used as conductors, the copper plates are arranged at intervals in the width direction, and electrolytic capacitors are arranged in parallel between the ends of each copper plate.